GOETHITE

goethite, gothite

(noun) a red or yellow or brown mineral; an oxide of iron that is a common constituent of rust

Source: WordNet® 3.1

Etymology

Noun

goethite (countable and uncountable, plural goethites)

(mineral) An iron oxyhydroxide that is the main constituent of rust.

Source: Wiktionary

Gö"thite, or Goe"thite (, n. Etym: [After the poet Göthe.] (Min.)

Definition: A hydrous oxide of iron, occurring in prismatic crystals, also massive, with a fibrous, reniform, or stalactitic structure. The color varies from yellowish to blackish brown.

Source: Webster’s Unabridged Dictionary 1913 Edition